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Get. 8, 1929. HAVUCEK 1,730,767

GEM STI CK HOLDER Filed March 18, 1927 2 Sheets-Sheet l 1 NVEN TOR.

TTORNEY /Z Oct. 8, 1929. F. HAVLICEK GEM STICK HOLDER Filed March 18,1927 2 Sheets-Sheet 2 I N VEN TOR.

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Patented Get. 8, 1929 FRANK HAVLICEK, OF WINDSOR, FORD CITY, ONTARIO,CANADA, ASSIGNOR OF THIRTY PER CENT TO ANDRO SUIE'PER, OF WINDSQR, FORDCITY, CANADA GEM-STICK norinnn Application filed March 1 8, 1927. SerialNo. 176,511.

This invention relates togem cutting and polishing machines, and hasmore particular reference to an improvedform ofgem stick holder by meansof which the em may be effectively supported and adjusted to present itsfacets to the lapidary wheel or disk of such machines.

j The invention has more particular reference to a portable gem stickholder adapted to rest upon the table of the gem cutting or polishingmachine and to be held in proper position to maintain engagement of thegem with the lapidary Wheeler disk, and a more specific object of theinvention is to provide a gem stick holder of this type which is ofgenerally simplified and improved construction. l

A further object is to provide a gem stick holder of the above characterembodying a support of improved form adapted to rest upon the table ofthe gem cutting or polishing machine, and a gem sticksocket adjustablycarried by the support for permitting angular and axial adjustments ofthe gem relative to the lapidary wheel or disk for properly presentingthe facets of the gem to said wheel or disk.

Still another object of the invention is to provide improved means formounting the gem stick socket upon the support for axial rotary andangular adjustment.

Other objects will become apparent as the nature of tie invention isbetter understood, and the same consists in the novel iorm, combinationand arrangement of parts hereinafter more fully described,shown in theaccompanying drawings and claimed.

In the drawings, wherein like reference characters indicatecorresponding parts parts throughout the several views,

Figure 1 is a side elevational View of a gem cutting or polishingmachine having a gem stick holder, constructed in accordance with thepresent invention, resting upon the table thereof, and carrying a gemstick with the gem in operative engagement with the lapidary disk orwheel of the machine;

Figure 2 is an enlarged side elevational View of the gem stick holderlooking at the opposite side thereof from that shown in Figure 1;

Figure 3 is a top plan View of the device shown in Figure 2 Figure 4% isa side elevational view of the holder looking at the opposite sidethereof -from that shown in Figure 2;

Figure 5 is an end elevational view looking toward the left of Figure 4and Figure 6 is an enlarged transverse section taken substantially uponline'66 of Figure i j 5 Referring more in detail to the drawings, theusual gem cutting or polishing machine embodies a horizontal lapidarydisk or wheel 5 which issecured upon a vertical spindle 6, the topbearing. for which is provided in the head of a vertical bracket 7secured upon the table 8, and the bottom bearing of which is provided inthe head ofa bracket 9 secured to the underside of the table. The lowerportionof the spindle is furnished with a driving pulley 10 as is alsousual.

The gem 11 is adapted to be cut or polished upon the upper surface ofthe lapidary wheel 5 and is usually cemented to the end of a gem stick12 so as to be held with its axis in the axis of the gem stick.

The present gem stick holder includes a support composed of a verticalplate 13 preferably formed of wood and having suitable metal. wearplates 14 secured 'to the lower or bottom edge thereof. Thesupportfurther includes a horizontal arm in the form of a horizontallyelongated plate 15 which extends from one side of the plate 13 and ispivoted at one end to the latter so as to be laterally tiltable oraxially rotatable relative to the plate 13 upon a horizontal axis. Forthis purpose, the mentioned end of the arm plate 15 is provided with alongitudinally projecting pivot bolt which extends through and isrotatable in an opening provided in the upper portion of the plate 13intermediate the ends of the latter, and a wing nut 17 is threaded uponthe projecting end of the bolt 16 in engagement with the face of theplate 18 opposite that at which the adjacent end of the arm plate 15 isdisposed, whereby the plates 13 and 3.5 are held connected.- tit-namely,upon loosening the nut 17 the arm plate 15 may be laterally tilted abouta horizontal axis defined by the bolt 16, and upon tightening the nut 17said arm plate 15 may be retained against movement relative to the plate15 Su as to be maintained in any laterally tilted position to which itis adjusted. The plate 13 is Cal adapted to be disposed to rest upon thesurface of the table 8 at one side of the wheel 5 with the arm 15projecting toward the wheel as shown in Figure 1 for a purpose whichwill presently become apparent, and the lower edge of the plate 13 ismade perfectly flat so that it will not readily tilt in a directionlaterally of the arm 15.

A U-shaped bracket 18 is carried by the outer free end portion of thearm 15, adjacent and at one side of the latter as clearly shown inFigures 3 and 5. Rigid with the forward end of this bracket 18 is apivot bolt 19 which passes through and is rotatably disposed in atransverse horizontal. opening provided in the lower portion of theouter end of arm plate 15 whereby said bracket may be angularly adjustedin a vertical plane or about a horizontal axis relative to the arm plate15. A wing nut 20 is threaded upon the projecting end of the pivot bolt19 at the opposite side of the arm plate 15 so as to maintain the boltin place and retain the bracket 18 connected to the arm plate 15 in anobvious manner. Formed in the outer end of the arm plate 15 concentricto and above the bolt 19 is an arcuate slot 21, and rigid with the inneror rear end of the base of bracket 18 is a clamping bolt 22 thatprojects through and is freely movable in this slot. A wing nut 23 isthreaded upon the bolt 22 at the opposite side of the arm plate 15, andit is thus apparent that upon loosening the nuts 20 and 23 the bearingbracket 18 may be tiltably or angularly adjusted about the horizontalaxis defined by the bolt 19 to assume different inclinations, and upontightening the nuts 20 and 23 said bracket 18 may be secured in any ofits angularly adjusted positionsf As shown clearly in Figure 3, the legsof the bracket 18 project laterally of the arm 15 and are provided attheir outer ends with bearings 24: which are aligned longitudinally ofthe arm 15 and have the shank 25 of a gem stick socket 26 suitablyjournaled and secured therein so that said socket is rotatable upon anaxis angularly adjustable with the bracket 18 relative to the arm 15.The socket 26 may be of any well known or preferred type within whichthe end of the gem stick 12 may be suitably fitted and secured againstdisplacement and axial rotation relative to the socket.

Suitably splined or secured upon the shank of the socket 26 in slightlyspaced side by side relation are a plurality of ratchet wheels 27 havingdiffering spacings of teeth. The arms of the bracket 18 are providedwith. upstanding posts 28 in which the ends of a guide rod 29 aresecured so that said rod is supported above and near the inner side ofthe shank 25 and the ratchet wheels 27 parallel to the axis of thesocket 26. A suitable spring pressed pawl 30 is pivotally and slidablymounted upon the guide rod 29 so that it may be shifted longitudinallyof the shank 25 into opera tive relation with any desired one of theratchet wheels 27, the pivotal movement of the pawl being simply toallow its normal spring pressed engagement with the ratchet Wheelcoincident with which it is adjusted. In this way, an effective supportfor the pawl is had and the use of a separate pawl for each ratchetwheel is rendered unnecessary. The teeth of the ratchet wheels 27 allface in the same direction, and the pawl 30 engages the teeth so as tomaintain the socket 26 and nuturally the gem and stick against rotationin one direction, which is the direction in which they would be rotated,if allowed, by the engagement of the gem with the lapidary disk. It isthus apparent that the pawl and ratchet mechanism described will preventundesirable accidental rotation of the gem when engaged with thelapidary disk, although permitting ready manual rotary adjustmentthereof in the opposite direction for permitting successive engagementof the facets of the gem with the surface of the disk. In order tofacilitate the rotary adjustment of the socket 26, a suitable knob orhand wheel 31 is fixed upon the shank 25 between the rear bearing 24 andthe rearmost ratchet wheel 27.

It will be noted in Figure 4 that the pivot bolt 19 or horizontal axisof vertical angular adjustment of the socket 26 is disposed in a planebelow that of the pivot bolt 16 about which the arm plate 15 tiltslaterally relative to the plate 13. Thus, by effecting lateral tiltingadjustment of the arm plate 15, the elevation of the socket 26 relativeto the table 8 may be adjusted or changed so that the gem 11 may beproperly raised or lowered to effect the proper engagement of itsdifferently disposed facets with the surface of the lapidary disk. Theseadjustments are necessary from time to time in view of the differentangular adjustments of the sockets and different sized gems operatedupon.

The general manner of use of gem stick holders of this type is wellknown in the art, and for this reason it is not believed necessary todwell at length upon a description thereof.

However, it is noted that the device is placed as shown in Figure 1 sothat the plate 13 rests at its lower edge u on the table 8 at one sideof the lapidary disk 5, and the horizontal arm plate 15 projects towardsaid lapidary disk. It is of courseto be understood that the gem stickwith the gem previously secured thereto has been fitted and secured inthe socket 26. The bracket 18 is then swung in a vertical plane to thenecessar angular position relative to the arm 15 so t at one of acertain series of facets of the gem is disposed parallel, in onedirection, with the upper face of the disk 5. This face is adjustedparallel with the upper surface'of the disk in a transverse or oppositedirection by laterally tilting the arm 15, and then the bracket 18 andarm 15 are secured in their properly adjusted positions by tighteningthe several wing nuts. After this facet of the gem has been properly cutor polished, the next facet of the same series is presented to the wheelor disk by simply rotating the socket and consequently the gem abouttheir axes. The degree of movement necessary is accurately determined bythe provision of the ratchet mechanism above described so that effectiveand uniform work is insured.

From the foregoing description it is believed that the construction andoperation as well as the advantages of the present invention will bereadily understood and appreciated by those skilled in the art.

Minor changes may be made without departing from the spirit and scope ofthe invention as claimed.

What I claim as new is In a gem stick holder, a supporting plate adaptedto rest at its lower edge upon the table of a gem cutting machine, anarm plate projecting horizontally from said supporting plate and pivotedat its inner end to thelatter for lateral tilting adjustment about ahorizontal axis extending parallel with the arm, a gem stick socketcarried by and angularly adjustable relative to the arm plate upon anaxis extending transverse to the arm plate and the socket in a planebelow that of the first named axis, a bracket pivoted to and disposed atone side of the arm plate and carrylo ing said socket, said socket beingjournaled in the bracket for axial rotation, a series of ratchet wheelssecured on the socket, and a single pawl supported by and adjustablelongitudinally of the socket for selective operative association withany desired one of said ratchet wheels, said bracket carrying a rod Yparallel with the socket and upon which said pawl is freely slidable. v

In testimony whereof I afiix my signature.

5e FRANK HAVLICEK.

